AirHint found the following cheapest return flights from Sydney (SYD) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

03 Dec - 16 Dec	Cathay Pacific
04 Dec - 12 Dec	Cathay Pacific
07 Dec - 23 Dec	China Southern
08 Dec - 24 Dec	China Southern
05 Dec - 12 Dec	China Southern
05 Dec - 27 Dec	China Southern
01 Dec - 08 Dec	Thai Airways
02 Dec - 23 Dec	Thai Airways
01 Dec - 17 Dec	Thai Airways
01 Dec - 16 Dec	Thai Airways
02 Dec - 18 Jan	Singapore Airlines
05 Dec - 01 Jan	Thai Airways
06 Dec - 01 Jan	Thai Airways
08 Dec - 01 Jan	Thai Airways
14 Dec - 13 Jan	AirAsia X
13 Dec - 13 Jan	AirAsia X
31 Dec - 13 Jan	China Southern
31 Dec - 30 Jan	Malaysia Airlines
06 Dec - 02 Jan	Thai Airways
30 Dec - 28 Jan	Thai Airways

Also check the deals for one-way flights from Sydney to Kathmandu in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sydney to Kathmandu in December from 856€

Return flights